added dump_textfile() and textfile_to_binaries() functions for dumping and loading an NLMSA via plain text file.
added dump_textfile() and textfile_to_binaries() functions for
dumping and loading an NLMSA via plain text file.

ctb/pygr,GenDataPro/pygr,GenDataPro/pygr,theoryno3/pygr,theoryno3/pygr,GenDataPro/pygr,RitwikGupta/pygr,RitwikGupta/pygr,ctb/pygr,ctb/pygr,ctb/pygr,RitwikGupta/pygr,cjlee112/pygr,cjlee112/pygr,ctb/pygr,theoryno3/pygr,cjlee112/pygr,cjlee112/pygr